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I can take you and immediately start designing batteries, because we need ions in motion, we need small ions in motion.
我可以从此让你快速起步设计电池，因为我们需要能运动的离子，我们需要能运动的小型离子。
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And, we'll talk about fuel cells later in the semester when we do the unit on redox reactions and electrochemistry.
这学期我们随后会讨论燃料电池,当我们讲到,关于氧化还原反应和电化学单元时。
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see people with them, and what happens here is it's supposed to be those noise cancellation headphones. All they do is they take in the ambient noise that's around it, and there's actually battery in the headphones, that then produces waves that are going to destructively interfere with that ambient noise.
我从来没有用过这个,但你会看到有人带他们,它们可以作为消噪音耳机,它们所做的就是采入,周围的随机噪声，耳机里面是，有电池的，然后它能产生和,随机噪声相干相消的声波。
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Because whenever I tell this story now, people start saying, " "Oh, well the evil machines are busy using your body as a battery" or whatever it was in the movie, right?
因为现在我一讲这个故事，人们就会说，“邪恶的机器忙着把你的身体当电池“,不管电影是怎样刻画的了？
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Imagine how much power it takes to drive an artificial heart, so you've got to have a battery or some way of generating power continuously to operate that and that makes it difficult to think about implantable and so that's a really good example of Biomedical Engineering.
驱动人工心脏所需要的能量是难以想像的,所以需要电池或者是某种持续发电装置,来给人工心脏提供能量,这就增加了人工心脏的植入难度,这是很好的生物医学工程的例子
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It's all chemical processes. Second, pardon me, second is batteries.
这都是化学的过程，第二，不好意思，第二是电池。
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So, this is what goes on in an electrolysis cell, and it works thanks to input energy from a power supply shown here.
所以，这是在一个电化学电池中发生的，它是靠输入的能量工作的,从和这个类似的电源输出的能量。
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So, people are talking about the use of hydrogen in fuel cells.
人们在讨论,如何把氢用在燃料电池中。
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Electrolysis of magnesium chloride in a cell where the one electrode we would make magnesium.
在电池内电解氯化镁,我们能在其中一个电极上得到镁。
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Make sure you have batteries that are in a good state of charge in your calculator.
确保你的计算器电池,处在一个良好的状态。
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They carry a potential, that is, if you could - if you had a tiny, tiny electrical meter, you could one put one electrode on one side of the cell membrane, on the extracellular side and one on the intracellular side and measure, you would measure a potential difference; just like a battery you would measure a potential difference.
它们带有电势,就是说,如果你能有一个足够小的电位计,可以把一个电极放在细胞膜一侧,假设放在细胞外的一侧,另一个电极放在细胞内侧并测量,你能测到一个电势差,就像电池那样能测到电势差
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So, for example, in an electrochemical cell, it would be possible to take the sodium ion, give back its electron, and convert it into a metallic sodium, take the chloride ion, remove its electron, and restore chlorine gas.
所以，例如一个电化学的电池，它可能带有钠离子，让它得到电子，把它变成金属钠，得到氯离子，让它失去电子，作为氯气储存。
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The energy is not flowing from the batteries through the wires to the CD component.
能量无法再从电池,通过电线流入CD部件中
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It comes from the fact that in an electrochemical cell, the cations are those that are reduced.
这来源于在电池中，正离子是被减少的。
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The only thing that stands between us and that is a suitable battery.
而之间唯一的困难则是,合适耐用的电池。
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That's not because previously--we had a CD inside of it, we had some batteries.
那并不是因为我们之前在里面放了一张CD,装上了电池
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